VerProductCompareVersions

The VerProductCompareVersions function compares version information and returns a value indicating the result of the comparison.

Syntax

Parameters

Return Values

VerProductCompareVersions Return Values
Return Value	Description
VERSION_COMPARE_RESULT_NOT_INSTALLED	No version of the product is installed or the installed version was not found (IFX_INSTALLED_VERSION is a null string).
VERSION_COMPARE_RESULT_SAME	The update setup's version is the same as the version currently installed on the target system.
VERSION_COMPARE_RESULT_OLDER	The update setup's version is older than the version currently installed on the target system.
VERSION_COMPARE_RESULT_NEWER_NOT_SUPPORTED	The update setup's version is newer than the version currently installed on the target system, but the currently installed version is not supported by the update setup.
VERSION_COMPARE_RESULT_NEWER	The update setup's version is newer than the version currently installed on the target system, and the currently installed version is supported by the update setup.
< ISERR_SUCCESS	The function failed.

Comments

The function compares the values of the system variables IFX_INSTALLED_VERSION and IFX_PRODUCT_VERSION to determine if the version currently installed on the target system is older than the update setup's version; if so, the function compares the values of the system variables IFX_INSTALLED_VERSION and IFX_SUPPORTED_VERSIONS to determine if the update setup applies to the currently installed version.

VerProductCompareVersions is called by the default code for the OnSetUpdateMode and OnUpdateUIBefore event handler functions.